Question

Why are oxides in higher oxidation states mode acidic than in lower oxidation stages?

Answer 1

In the case of a lower oxide of an element, the atom has a low oxidation state. This means that some of the valence electrons of the metal atom are not involved in bonding. The atom in lower oxidation state therefore is not electron deficient. As a result, it can donate electrons and behave as a base.

On the other hand, in the case of a higher oxide, an atom has a high oxidation state. This means that more number of valence electrons are involved in bonding and so, they are unavailable. In other words, . As a result, it can accept electrons and behave as an acid.


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Answer 2

Element with higher oxidation state is more acidic than the compound of that element with lower oxidation state .This is because, as the charge increases because oxidation state increases the density charge of that atom will increase constantly such that atom strongly pulls the electron towards it from other mollecule that causes that it comes closer or combine with it.
As some elements have hydrated ions these have higher oxidation state as well as some elements have lower oxidation state .
When the process of hydrolysis is done the hydrogen will pull the element which have higher oxidation state as it's electron affinity is higher toward the element with higher oxidation state than the lower one.
sometimes during this process the higher oxidation state element form hydronium ions as well which leads the element to show acidic behaviour